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19.3% Efficiency ternary organic solar cells enabled by the alkyl side-chain effect of guest non-fullerene acceptors

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Science China Chemistry 2024年第8期67卷 2686-2693页

作者： Hongqian Wang Sijian Wu Daobin Yang Xueliang Yu Shuncheng Yang Pengfei Ding Pengyu Yan Zaifei Ma Jianfeng Zhang Ziyi Ge School of materials Science and Chemical engineering Ningbo UniversityNingbo 315211China Zhejiang engineering Research center for Energy Optoelectronic materials and Devices Ningbo Institute of Materials Technology and EngineeringChinese Academy of SciencesNingbo 315201China State Key Laboratory for Modification of Chemical Fibers and Polymer materials Center for Advanced Low-dimension MaterialsCollege of Materials Science and EngineeringDonghua UniversityShanghai 201620China center of materials Science and Optoelectronics engineering University of Chinese Academy of SciencesBeijing 100049China

The effect of side-chain engineering of conjugated molecules on the morphology and device performance in binary organic solar cells has been widely investigated. However, this relationship has hardly been studied in the guest components of ternary organic solar cells. In this study, a family of non-fullerene guest acceptors, namely XY-3, XY-5 and XY-7, with hydrogen substituent,straight and branched alkyl chains on the bithiophene units, respectively, were designed and synthesized to understand their effects on aggregation properties and device performance. The straight and branched alkyl chains on the bithiophene units result in sightly blue-shifted absorption compared to the hydrogen substituent and the XY-7 demonstrates the most appropriate phase separation scale and the most balanced charge transport. Consequently, the OSCs based on D18:e C9:XY-7 achieve a high shortcircuit current density(JSC) and fill factor(FF), while maintaining the enhancement of the open-circuit voltage(VOC) achieving an efficiency of 19.32%, exceeding those of D18:e C9, D18:e C9:XY-3, D18:e C9:XY-5(PCE:18.28%, 19.04%, 18.75%, respectively). These results highlight that the side-chain engineering of Y series non-fullerene acceptors as the guest acceptors has great potential in optimizing morphology properties and promoting photovoltaic performance.

关键词： organic solar cells side chain engineering ternary strategy non-fullerene energy losses

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Thermal, Mechanical and Electrical Properties of the PEO-based Solid Polymer Electrolytes Filled by Yttrium Oxide Nanoparticles

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Journal of Wuhan University of Technology(materials Science) 2012年第3期27卷 495-500页

作者：梁桂杰 Research center for materials Science & engineering Xiangfan University College of materials Science & engineering Xi'an Jiaotong University

The novel composite lithium solid polymer electrolytes （SPEs） composed of polyethylene oxide （PEO） matrix and yttrium oxide （Y2O3） nanofillers were prepared by a solution casting method. The crystal morphology of the SPEs was characterized by polarized optical microscope （POM） and wide-angle X-ray diffraction （WAXD）. The induced nucleation and steric hindrance effects of Y2O3 nanofillers result in the increased amount as well as decreased size of PEO spherulites which are closely related to the crystallinity of the SPEs. As the Y2O3 contents increase from 0 wt% to 15 wt%, the crystallinity of the SPEs decreases proportionally. The thermal, mechanical and electrical properties of the SPEs were investigated by thermal gravimetric analysis （TGA）, dynamic mechanical analysis （DMA） and AC impedance method, respectively. The physical properties including thermal, mechanical and electrical performances, depending remarkably on the polymer-filler interactions between PEO and Y2O3 nanoparticles, are improved by different degrees with the increase of Y2O3 contents. The （PEO）21LiI/10 wt%Y2O3 composite SPE exhibits the optimal room-temperature ionic conductivity of 5.95×10-5 Scm-1, which satisfies the requirements of the conventional electrochromic devices.

关键词： solid polymer electrolytes yttrium oxide thermostability mechanical property ionic conductivity

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Corrosion and mechanical properties of AM50 magnesium alloy after being modified by 1 wt.% rare earth element gadolinium

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Journal of Rare Earths 2014年第6期32卷 558-563页

作者：杨淼刘耀辉刘家安宋雨来 Key Laboratory of Automobile materials Ministry of Education College of Materials Science and EngineeringJilin University engineering Training center Beihua University

In order to improve the corrosion and mechanical properties of AM50 magnesium alloy, 1 wt.% Gd was used to modify the AM50 magnesium alloy. The microstructure, corrosion and mechanical properties were evaluated by X-ray diffraction （XRD）, scanning electron microscopy （SEM）, energy dispersive spectroscopy （EDS）, electrochemical and mechanical stretch methods. The results indicated that β-Mg17Al12 phase decreased and Al2Gd3 and Al0.4GdMn1.6 phase existed after Gd addition. Because of the Gd addition, the grain of AM50 magnesium alloy was refined significantly, which improved the tensile strength of AM50 magnesium al-loy. The decreasing ofβ phase improved the corrosion resistance of the magnesium alloy. The fracture mechanism of the Gd modified AM50 magnesium alloy was quasi-cleavage fracture. The corrosion residual strength （CRS） of AM50 magnesium alloy was im-proved after 1 wt.% Gd addition.

关键词： magnesium alloy rare earth element Gd corrosion corrosion residual strength rare earths

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Hot Deformation and Work Hardening Behavior of an Extruded Mg–Zn–Mn–Y Alloy

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Journal of materials Science & Technology 2015年第12期31卷 1161-1170页

作者： N.Tahreen D.F.Zhang F.S.Pan X.Q.Jiang D.Y.Li D.L.Chen Department of Mechanical and Industrial engineering Ryerson University College of materials Science and engineering Chongqing University National engineering Research center for Magnesium Alloys Chongqing University Advanced materials Research center Chongqing Academy of Science and Technology Faculty of materials and Energy Southwest University Department of Chemical and materials engineering University of Alberta

The aim of this study was to evaluate the strain hardening and hot deformation behavior of asextruded Mg-Zn-Mn （ZM31） magnesium alloy with varying Y contents （0.3, 3.2, and 6 wt%） via compression testing along the extrusion direction at room temperature, 200℃ and 300 ℃. Texture and phases were identified by X-ray diffraction. Alloy ZM31 ＋ 0.3Y consisted of a mixture of fine equiaxed grains and elon- gated grains with 1-phase （Mg3YZno）; alloy ZM31 ＋ 3.2Y contained 1-phase and W-phase （Mg3Y2Zn3）; alloy ZM31 ＋ 6Y had long-period stacking-ordered （LPSO） X-phase （Mg12YZn） and Mg24Y5 particles. With increasing Y content the basal texture became weakened significantly. While alloys ZM31 ＋ 0.3Y and ZM31 ＋ 3.2Y exhibited a skewed true stress-true stain curve with a three-stage strain hardening feature caused by the occurrence of {1072} extension twinning, the true stress-true stain curve of alloy ZM31 ＋ 6Y was normal due to the dislocation slip during compression. With increasing temperature the extent of skewness decreased. While the compressive yield stress, ultimate compressive stress, strain hardening exponent, and hardening capacity all decreased as the temperature increased, the retention of the high- temperature deformation resistance increased with increasing Y content mainly due to the presence of thermally-stable LPSO X-ohase.

关键词： Magnesium alloy Yttrium effect Temperature effect Strain hardening I and W-phase LPSO X-phase

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New criterion in predicting glass forming ability of various glass-forming systems

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Chinese Physics B 2008年第1期17卷 249-254页

作者：杜兴篙黄志青 Institute of materials Science and engineering Center for Nanoscience and Nanotechnology National Sun Yat-Sen UniversityKaohsiung Department of materials engineering Shenyang Institute of Aeronautical Engineering

It has been confirmed that glass-forming ability （GFA） of supercooled liquids is related to not only liquid phase stability but also the crystallization resistance. In this paper, it is found that the liquid region interval （T1 - Tg） characterized by the normalized parameter of Tg/T1 could reflect the stability of glass-forming liquids at the equilibrium state, whilst the normalization of supercooled liquid region △Tx=（Tx - Tg）, i.e. △Tx/Tx （wherein T1 is the liquidus temperature, Tg the glass transition temperature, and Tx the onset crystallization temperature） could indicate the crystallization resistance during glass formation. Thus, a new parameter, defined as ζ = Tg/T1＋△Tx/Tx is established to predict the GFA of supercooled liquids. In comparison with other commonly used criteria, this parameter demonstrates a better statistical correlation with the GFA for various glass-forming systems including metallic glasses, oxide glasses and cryoprotectants.

关键词： glass-forming systems glass forming ability criterion

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Lamellar morphology of directional solidified Ti–45Al–6Nb–xW alloys

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Rare Metals 2016年第1期35卷 65-69页

作者： Zhi-Yuan Hou Yong-Sheng Li Hao-Jie Mei Kai Hu Guang Chen School of materials Science and engineering Nanjing University of Science and Technology engineering Research center of materials Behavior and Design Ministry of Education

Directional solidification of Ti-45Al-6Nb-xW（x=0,0.4,0.8;at%） alloys was performed by Bridgeman method with the stable growth rate of 5,10,and 20 μm·s^（-1）.The differential scanning calorimeter（DSC） results indicate that both the eutectic temperature and the transition temperature of α（Ti_3Al） to γ（TiAl） increase with W content increasing from 0 at%to 0.8 at%.For the stable growth rate of 10 μm·s^（-1）,the orientations of α_2（Ti_3Al）/γ（TiAl）lamellae change from 45°（0 at%W） to 0° and near 0°（0.4at%and 0.8 at%W） to the crystal growth direction,and the spacing of α_2/γ lamellae decreases with W content increasing from 0 at%to 0.4 at%,while it increases when W content is 0.8 at%.With the increase in growth rate from5 to 10 and 20 μm·s^（-1）,the lamellar spacing of α_2/γbecomes smaller,and the lamellar thickness becomes more uniform.

关键词： Ti-Al-Nb--W alloy Directionalsolidification Lamellar morphology Lamellar spacing

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Humidity sensing properties of La^(3+)/Ce^(3+)-doped TiO_2-20 wt.% SnO_2 thin films derived from sol-gel method

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Journal of Rare Earths 2010年第1期28卷 123-127页

作者：李红霞史志铭刘红伟 School of materials Science and engineering Inner Mongolia University of Technology Inner Mongolia Research center of Advanced materials engineering & Technology

The humidity sensing properties of La3+/Ce3+-doped TiO2-20 wt.%SnO2 thin films were ***-gel method was employed to prepare the films on alumina *** constructing a humidity-impedance measuring system,the sensing behaviors were inspected for the films sintered at different *** results showed that,0.5 wt.% of La2O3 or Ce2O3 doped films sintered at 500 °C for 2 h had the best humidity sensing properties,the impedance decreasing from 109 ? to below 104 ? in the humidity ra...

关键词： humidity sensing titania thin film rare earths

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Improving mechanical properties of Mg-Sn alloys by co-addition of Li and Al

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Progress in Natural Science:materials International 2023年第3期33卷 355-363页

作者： Zhen Pan Hucheng Pan Yu Huang Zhihao Zeng Zhang-Zhi Shi Chubin Yang Yuping Ren Lu-Ning Wang Gaowu Qin Key Laboratory for Anisotropy and Texture of materials (Ministry of Education) College of Materials Science and Engineering Northeastern University Beijing Advanced Innovation center for materials Genome engineering Key Laboratory for Advanced Materials Processing of Ministry of Education School of Materials Science and Engineering University of Science and Technology Beijing Jiangxi Provincial engineering Research center for Magnesium Alloy Gannan Normal University

In this work, a novel low-alloyed Mg-Sn-Li-Al alloy with high-strength has been developed. The addition of ～1 wt% Li into the Mg-2Sn wt.% binary alloy can change the type of strengthening phases in Mg-2Sn-1Li sample(TL21),involving the formation of both Li2Mg Sn and Mg2Sn phases. The co-addition of ～1 wt% Al and ～1 wt% Li can further induce the higher density of both micron-sized phases and nano-precipitations in the Mg-2Sn-1Li-1Al sample(TLA211). The nano-precipitations can inhibit the grain growth, which thus lead to the fine grain size of ～1.38 μm in TLA211 sample, and ～1.59 μm in the TL21 sample. Besides, the profuse nano-phases would improve the yield strength via Orowan hardening effect. Consequently, the TL21 sample can exhibit the high yield strength of ～204 MPa, and elongation of ～6.6%. The TLA211 sample exhibits the much higher yield strength of～250 MPa, ultimate tensile strength of ～291 MPa, and also high elongation of ～9.0%. The high strength-ductility synergy, together with the low-Sn content, make the present Mg-Sn based alloy to be potential for the wider industrial applications.

关键词： Mg wrought alloy Nano-precipitations Strengthening Grain refinement Mechanical properties

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Dual-band simultaneous lasing in MOFs single crystals with Fabry-Perot microcavities

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Science China Chemistry 2019年第8期62卷 987-993页

作者： Hongjun Li Huajun He Jiancan Yu Yuanjing Cui Yu Yang Guodong Qian State Key Laboratory of Silicon materials Cyrus Tang Center for Sensor Materials and ApplicationsSchool of Materials Science and EngineeringZhejiang University

Multi-band microlasers based on single microcrystalline materials with Fabry-Perot(F-P) cavities are critically and technologically essential. Here, we demonstrate simultaneous dual-band lasing output(615 and 685 nm) in metal-organic frameworks(MOFs) and organic dyes hybrid single crystals, which support F-P resonances. Through a two-step assembly strategy, two different types of cationic pyridinium hemicyanine dye molecules can be encapsulated into the channel pores of anionic bioMOF-1-2 Me successfully. In addition, the employment of the host-guest system significantly increases the dye loading, enhances luminescent efficiency, and diminishes the aggregation-caused quenching(ACQ) effect in the resultant MOFs/dye *** finding not only combines the characteristic of MOFs materials with excellent luminescent properties of organic dyes, but also points out a simple and promising strategy to design multi-band microlasers based on F-P mechanism, opening a low-cost avenue for the rational design of miniaturized lasers in the future.

关键词： dual-band lasing metal-organic frameworks organic dye Fabry-Perot cavity

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Structural, phonon, mechanical, optical, and thermodynamic properties of stable β-La_2S_3 from first-principles calculations

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Journal of Rare Earths 2017年第3期35卷 271-279页

作者：张显桂文华吴茜曾庆丰 School of Advanced materials and Nanotechnology Xidian University International center for materials Discovery School of Materials Science and EngineeringNorthwestern Polytechnical University

The band structures,density of states,phonon,optical properties,and thermodynamic properties of β-La_2S_3 were calculated from first-principles using the plane-wave pseudopotential ***,the structures were fully relaxed through the first-principles ***,the zone-center phonon-mode frequencies were evaluated within the framework of density functional perturbation *** related to the structure,phonons,optics,elastic constants,and thermodynamics of β-La_2S_3 were *** dielectric function,refractive index,absorption coefficient,extinction coefficient,infrared（IR） reflectance,energy,heat capacity,and Debye temperature spectra were also given β-La_2S_3 was a direct-gap semiconductor,and calculation indicated that its energy gap was 0.191 *** the phonon spectra,it could be concluded that the lattice dynamics were stable.A strong IR reflection occurred in a range of 0-1000 nm,arising from several strong IR-active modes,resulting in poor transmission *** good transmission properties were observed in the range above 2000 nm,with low reflectivity and dissipation due to the absence of IR-active or weak modes.

关键词： β-La2S3 first-principles optical properties elastic constant thermodynamic properties rare earths

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